Why does everyone hate Lucifer?

I wish to know why I don't hate Lucifer. I just can't seem to bring myself to hate him and i cry for him. And I don't understand why does everyone hate him when the incident he did was so so long ago. Also, I wasn't even born at the time he did those things so why I just I am not joking. I'm not trying to be rude; I just don't understand why am I like this.